Blade-fastening.



PATENTED DEC. 31, 1907.

N. G. BASSETT. BLADE FASTENING. APPLICATIOI FILED OUT. 29, 1906. ,Bmvnw'nn um-2s. 1907.

INVENTOR I HTTORNET.

- It is commonin steam turbines, for example, ated holding member for r 'a-plurality of bl I elongatedgroove or-recess provided by the TE STAT A errcrrro NORMAN C. BASSETT, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-OHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

BLADE-FASTENING.

Specification of Letters Patent.

.Patented Dec. 31, 1907.

Application filed October 2&1966. Serial No. 341.073- Renewed August 23. 1907- Serial No. 389|873- new and useful Improvements in Bl'adeFastenings, of which the following'is aspecification.

This invention relates to fastenin' devices suitable for fastening the blades of Enid proelledl engines, or the blades of fans or pumps or propelling fluid, and gpnerally it relates to a' fastening means w 'ch is capable of being used in any relation where it is desirable to firmly secure afplurality-of similarly associated elements to a member.

This invention relates specifically-to that class of devices, as steam turbines, for ex-' ample; Where a plurality of blades or-similar elements are assembled-in a holding member cess provided by the lade-carrying member.

to provide an elqn es, which is seated an blade-carrying member, and} the =holdin member, and blades, are then firmly secure in said recess by Ia separate calkingmember, piece or strip, which is forced into said recess;

' The urpose easily and cheaply constructed and with which the blades can be readily assembled, and the holding strip and assembled blades can then be securely fastened by a calk-ing' strip or strips within a recess provided by the blade-carrying member. 1

In the drawin s which accompany specification and orm a part thereof and -on which the same reference characters are 'applied "to the same elementswherever they a pear in each ofythe several 'views,'and

which illustrate embodiments ofthi's inventi0n,Figures 1 and 2 represent in section-a blade-carrying member, a holdingmember of this invention is to provide a holding member for the blades which is j recess.

4 wit actual practice the recess would be formed-as ioo and the blades ,may

'13 2. 6 re resents a plan view of a ho dln'gstrip whic is a modification of. the

specific form of holding strip shown by Fig. 5 Fig. 7 is a perspective view of a modified form of holding member with blades assembled therewith. Fi s. 8, 9,10, '11 and 12 represent'forms of bdades which are capable of being used in carrying out this invention.

The desirable features which should be embodied in devices similar to those .disclosed by the drawings are that the blades may be readily assembled with the holding strips, that the holding stripsv and blades maybe easily and cheaply formed, and that the assembled blades and holding strip can bejseriurely fastened in the recess of the blade-carrying memberwith the several parts so interlocked that there will be no an er of the parts becomin disassembled is for convenience'm t e s ecification and claims certam elements w1ll oe referred to as blades, it is to-be understood that the term blades soused is used'in a generic sense and is-intended to apply to all elementswhich are capable of being assembled in a similar relation re ardless of their particular structure or inten ed use, the term blades "v.

being used as this s ecific structure is espeorally applicable in t e construction of steam turbines.-

On the drawings the reference character 1- 1 I represents a blade-carrying-member which is provided with an elongated groove or recess I 2, and preferably one side of'said groove'is undercut as at 3.

, ,The blade-holding member is des' nated' by the reference character 4 and is pre erably provided with a projection 5 adapted to be seated in the unde'rcutside 3 of the groove or The gist of this. invention consists in providi an elongated blade-holding member a substantially continuous recess, in

acontznuous recess, and providing the blades with projections adapted to be seated in said continuous recess, whereby the bladeeholdvery expeditiously, a bladeholding memberand blades assembled therewit of the calking 'strlpe mg member 4 is readil and che'aplymade.

be ztsseinbled therewith being then ready for insertion n a groove or recess otthe blade-carrying member thecalk inclusive, are provided with a headed lower end 60, as clearly shown by said figures, and with blades of this con truction the holding member 4 is r -cessed at its bottom, as clearly shown at 7 in Fig. 5. Withthe holding member 4 provided with a recessed bottom, as

shown particularly by Fig. 5, but also'by Figs.

I hold 1, 2, 3, 4 and 6, the b ades are assembled with the blade-holding member 4 by being inserted into grooves which maybe cut in a side orsides of said member with the-projections or feet of the blades located in the recess 7' of the member 4.-

Wit the form of blade shown by the figures just referred to, or with other forms of blades, some of which are illustrated by the drawings, the same general structure could be realized by simply providing the member 4 with suitable shaped apertures extending therethrouglh from a recessed portion to the top, throng which the blades could be passed from the recessed portion, being prevented by the projecting head or its equivalent from being driven through said aperture when in the assembled relation, as shown by Fig. 1, for example.

The reference character 8 represents an ordinary form of calkin member or strip which is adapted to be: riven into the recess 2 between the assembled blades and bladecarrying member and the adjacent wall of the recess, and in some cases it is preferred that the feet or projections on the blades 6 shall extend outwardly from the member 4,

as clearly shown by Figs. 1 to 6 inclusive of the drawings, in order that said feet may be positively engaged by said calking strip 8. One wall of the recess may be provided-with a head or depression, as shown at 10, and the' holding member 4 and edges of the blades even may be similarly recessed, as shown at 11, to receive a part of the material of the calkin strip 8, in order to positively and secure y lock the several parts in position.

Instead of formin slots in the side of the blade-carrying mem er 4, which slots are of the same shape as the cross sections of the blades, the slots may be formed to such a shape, as shown by Fig. 6, that a blade may be placed in positlon against one side of the slot and the tooth or metal forming the other side of the slot may then be forced against said blade. There is an advantage in using this specific method-of holding the blades in the blade-holding member, as the blade-holding member, after the blades are secured therein, can be readily supplied with adepression similar to the depression 11, shown by Fig. 5. j ,1

In Fig. 7 is shown another form which may be given to the blade-holding member under his invention. In this case the blade-holding member 4 is provided with the continuous recess 17 in its side and the notches pro vided in the side of said blade-holding memerases her do not correspond in shape to the cross section of a blade; one side of each notch, however, conforms to the shape of a blade. With a construction like Fig. 7 where the continuous recess is provided in,a side of the blade-holding member, the projections on the blades are preferably located at such a height on 'the blades that when the foot of the blade is in the plane of the bottom of the blade-holding member, the projections will enter said continuous recess.

Figs. 7, 8 and 12 show blades which fulfil this condition. In Fig. 8 is shown a blade provided with a projection 20 on one face thereof, which is preferably formed by forcing a die against the opposite side of said blade. Fig. 12 shows a blade-which is pro vided with substantially two projections21, being preferably formed by forcing a die against the concave side of the blade and forcing the metal back until it is in line with the metal of the convex side of the blade. Fig. 9 shows a blade in which a foot is provided by bending over at right angles a art of the blade itself, portions at the side of blade being first cut away to facilitate the operation of bending. Fig. 10 shows a blade on which a somewhat deep depression 22 is formed, being preferably stamped by a die pressed against the opposite side of said lade. of Fig. 10.

It will be apparent from the whole and complete descri tion just given that by prothat illustrated in the Fig. 11 is asection on the line aa viding the bla e-holding member 4 witha substantially continuous recess, the blades may be very readily and quickly assembled therewith, and that it is immaterial whether the bottom of said blade-holding member be recessed, or a side, either one or both, or whether the bottom and a side he recessed.

\Vhat I claim is,

1. The combination with a blade-carrying member, provided with an elongated groove or recess, of an elongated blade-holding member, provided with a continuous recess extending substantially the length thereof, secured withinsaid elongated recess and blades with projections thereon, said rojec tions being engaged in the-recess of sai bladeholdingmember.

2. The combination with a blade-carrying member," provided with an elongated groove or recess, of an elongated blade-holding member, provided with a continuous recess extending substantially the length thereof, seated w th-in said elongated recess, blades with projections thereon, said projections being engaged in the recess of said blade-holding member. and means for securing the blades and blade-holding member in the recess of said blade-carrying member.

'3 The combination with a blade-carrying member, provided with an elongated recess,

. ing enga ed in the recess of said blade-holda side of which is undercut, of an elongated blade-holding member, provided with a continuous recess extending substantially the length thereof, seated in said, recess, blades. with projections thereon, said projections bein m'ember to secure the blades and blade- 10 ho lding member in the recess-of said bladeearrying member.- I

, In testimony whereof, I aflix my signature in the presence of two witnesses.

NORMAN C. BASSETT.

ing mem er, said blade-holding member bej Witnesses: ing provided with a projection engaged with FRANK E. DENNETT the undercut portion of said side and a oalk- JOHN OLSEN. v 

